With the continuous development of industry, heavy metal pollution has become a major problem that endangers the global environmental quality. In recent years, due to industrial "three wastes" and a large number of applications containing Cd fertilizer, a large number of heavy metal Cd into the soil after the soil caused by Cd pollution is becoming increasingly serious. Because Cd has a strong migration, Deactivator the soil Cd is easily absorbed by the plant through the food chain into the human body, thus endangering human health. Therefore, the improvement and remediation of Cd-contaminated farmland has become the focus and hotspot in the field of soil science and environmental science.
At present, the soil heavy metal pollution remediation technology commonly used physical methods are soil, soil, adsorption fixed, electric power repair method; Deactivator chemical treatment methods are leaching, application of improvers, biological reduction, complex extraction, etc .; also microbial , Plant repair and other measures. Among the many repair techniques, in situ chemical fixation is considered to be effective and costly for heavy metal Cd pollution in farmland soils. The key to this technology is to select the appropriate modifier, commonly used modifier types include alkaline materials, phosphorus-containing materials, Deactivator clay minerals, iron and manganese oxides and organic materials. These immobilized materials can change the presence of heavy metals in the soil by ion exchange, adsorption, precipitation and other passivation, and reduce the mobility and bioavailability of heavy metals in the soil. However, most studies have adopted short-term indoor potting methods, and there are few reports on the use of heavy metal pollution in the field, which can not reflect the actual situation of the remediation agent in the field, and because the field experiment conditions are more complicated and the results are not The same. Deactivator Such as Friesl and other found that the application of limestone in field conditions, industrial sludge and red mud to reduce the effect of barley absorption of Cd than the potting conditions of the application effect is poor; Wang Kairong found that the application of lime and cinder improved Cd pollution of paddy soil, Deactivator the field The effect of the test application is worse than that of the potting condition. It can be seen that the results of the pot experiment do not fully reflect the field application effect of the modifier, and the field test results are necessary for the practical application of the modifier.
The addition of the passivating agent was 0.5% of the soil weight of the tillage layer (mass fraction, the passivant and soil ratio was 1, Deactivator the thickness of the tillage layer was 20cm), and the lime content was 0.2% (mass fraction, lime And soil than 1).
In addition to CK (control, do not add any passivation agent), a total of 10 different treatment: calcium silicate phosphate fertilizer (CMP); in phosphate rock (PR); Pseudo-calcium (TSP) (PA + L); Yu phosphate + lime (PR + L); residual calcium + lime (TSP + L); Yu Mongolian soil + lime (MT + L); Deactivator over-calcium + lime (SP + L). Each processing is set to 3 repetitions. In the 15d after planting crops by the soil (depth 0 Yao 20cm), dried (dried), the large pieces of soil particles fine, Deactivator flat with PVC separator separated by 1m Iraq 1m experimental plot, partition buried depth 30cm, Exposed to the ground 20cm, sprinkle with passivation agent, fully mixed after the formation of land. Crop cultivation and management measures consistent with the normal production.
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